Crank-shaft



R. A. WHNHARDT.

CRANK SHMT.

APPunATmN HLED mums. 19:6.

Patented Jan. 20, 1920,

SH01/nuda OF VIRGN..

uname-snaar.

Appiieation le June 8,

To @Z5 lwhom t may come/rn:

il@ it known that. l, llenan-r Er. lilium*- imnnr, a Citizen of the United States oit i-rineric-a, .eenling at Chicag in the county ot tCook and IState et illinois, hi

,iin new and useful linie moments in vhatts, of which 'followins` is are .ciiieatien re'iereree hei had therein to areoinpanyingg i his iin'ention relates to eounterlnilaneed era-k shafts for inulti-cylinder` Xplosive engines and to an arrangement thereof whereby the running' 'parts are held in ance, as near as may be, when in rotation, by means se located in relation to the hearings et the shaft that torque between the bearings is obviated to a great extent and there is little tendency of the shaft to weave when turning at high speed.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended Claims.

in the drawings,

Figure l is a View of a crank shaft of a multi-cylinder explosive engine, counterbalan'ced and arranged to embody features oif the invention;

Figs. 2, 3, i, 5 and 6 are views in detail taken on the sei-tion lines H, Hl, 1V, V, and Vl, showinethe method and disposition of the counteroalance weight for the several portions et the shaft.

As herein indicated shown as one Atorni of the invention, a Crank shaft for a cylinder engine, has end journals l and 2 and intermediate journals with single throw cranks -i adjacent the journals l and 2, intermediate short'cranks 5 and 6 adjacent the intermediate journals 3, double throw Crank arms 7 and` 8 connected by wrist pineto the cranks 5 and 6, and other double throw arms 9 and l0, connected similarljfv to the cranks Yl. In order to maintain the running balance of the paits 4., 7, 8, 9 and l0, eminterhalanee weights ll and l2 are secured to the shaft adjacent the journals l and 2 at such angles, in relation to the parts as to provide substantially coinplate running balance to them and to the wrist pins. Similarly counterbalanee weights 13 on each side of he intermediate journal balance the parts and to which they are direetlj7 opposite.

As a result of this construction, the parts which lie adjacent to and between the two Speecatien of Letters Fatent.

atented Jan. 2i?, isi-s. serial nomesse.

outer and the middle journals are presided with eonnterbalanees at. such reiation te the journals as to minimise all torsional e'feets' weights seeured to the. shaft theA journal portions, counterbalance weights he tween any two pair of journals being4 ed fop maintain a balance with the crank arms and wrist pin connect-lons between said journals, and certain of the weights being disposed in angular relation to the compa ion cranks.

ln an explosive engine, .a counter-balanced crank shaft having a. plurality et' journals with `both single and double throw crank arms between the several pairs of journals and counteroala-nce weights each seeured to the crank shaft adjacent the jonrnal, certain oi' said weights being/g disposed in angular relation to the. companion crank arms and othersbeing radiallj7 disposed to their companion erank, arms and said weights being, list-ributed so that the pair of weights between each pair ot' journals compensate for the crank arms between said journals when the shaft is running and maintain a. substantially complete balance thereof'. f l

3. A Crank shaft for a six-cylinder eX- plosive engine comprising outer journal non tions and an intermediate journal portion with singleland double throw crank' arms between each outer journal and the intermediate journal, and eounterhalanee weights each secured to the shaft adjacent a. journal, each pair oi' eounterbalanee weights he tween each outer nd the intermediate j eine nal portions maintaining a substantially complete balance for the crank arms lying between said journal portions, certain of the counterbalance weights being secured in anA guiar relation to the eranl; arms which ythey i 1 i adaptbalance andI others being radially opposite tieir companion crank arms.-

4. 1n a crank shaft having` journal poi'- tions disposed at intervals connected by single and doubleutluow crank ai'ins, counterbalance Weightssecui'ed in angular relation to the several crank ai'ins at points adjacent the several journal portions, the pairv of counterbalance weights between each paii of journals being adapted to maintain a substantially perfect balance with the cank arms between said journals.

5. A crank shai't having a plurality of crank pins with radial arms and having 

